US20170324141A1 - Cpw-fed modified sleeve monopole for gps, glonass, and sdars bands - Google Patents
Cpw-fed modified sleeve monopole for gps, glonass, and sdars bands Download PDFInfo
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- US20170324141A1 US20170324141A1 US15/583,273 US201715583273A US2017324141A1 US 20170324141 A1 US20170324141 A1 US 20170324141A1 US 201715583273 A US201715583273 A US 201715583273A US 2017324141 A1 US2017324141 A1 US 2017324141A1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3291—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted in or on other locations inside the vehicle or vehicle body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
Definitions
- This invention relates generally to a thin film, flexible, wideband antenna configured on a dielectric substrate and, more particularly, to a thin film, flexible, wideband co-planar waveguide (CPW) antenna that may include transparent conductors so as to allow the antenna to be adhered to a visible part of vehicle glass, where the antenna is operable to receive circularly polarized signals for GPS/GNSS or satellite digital audio radio service (SDARS) frequency bands.
- CPW co-planar waveguide
- Modern vehicles employ various and many types of antennas to receive and transmit signals for different communications systems, such as terrestrial radio (AM/FM), cellular telephone, satellite radio, dedicated short range communications (DSRC), GPS, etc.
- AM/FM terrestrial radio
- cellular telephone is expanding into 4G long term evolution (LTE) that requires two antennas to provide multiple-input multiple-output (MIMO) signals.
- LTE long term evolution
- MIMO multiple-input multiple-output
- the antennas used for these systems are often mounted to a roof of the vehicle so as to provide maximum reception capability.
- many of these antennas are often integrated into a common structure and housing mounted to the roof of the vehicle, such as a “shark-fin” roof mounted antenna module.
- the vehicle glass such as the vehicle windshield
- glass typically makes a good dielectric substrate for an antenna.
- AM and FM antennas are fabricated within the glass as a single piece.
- these known antennas are generally limited in that they can only be placed in a vehicle windshield or other glass surface in areas where viewing through the glass is not necessary.
- the transmitted signals are left-hand or right-hand circularly polarized because the ionosphere acts to rotate the transmitted signal, which would otherwise affect linearly polarized signals.
- a suitable antenna capable of being mounted on vehicle glass and being applicable to receive right-hand or left-hand circularly polarized signals.
- the present invention discloses and describes a thin film, flexible antenna that has particular application to be adhered to a dielectric substrate on a vehicle, such as a vehicle glass, where the antenna has a wideband antenna geometry and is operable to receive right-hand or left-hand circularly polarized signals from, for example, GPS and SDARS satellites.
- the antenna is a printed planar antenna formed to the substrate and includes a ground plane having a slot formed therein and a tuning sleeve having a vertical portion and a horizontal portion.
- the planar antenna further includes a radiating element positioned adjacent to the tuning sleeve and including a feed portion positioned within the slot, where the radiating element includes a first horizontal portion and a second horizontal portion extending from a vertical portion towards the vertical portion of the sleeve.
- the ground plane is operable to generate circularly polarized signals to be received by the radiating element where the sleeve provides phase tuning of the signals.
- FIG. 1 is front view of a vehicle showing a vehicle windshield
- FIG. 2 is a rear view of the vehicle showing a vehicle rear window
- FIG. 3 is a profile view of a vehicle window including a thin, flexible antenna formed thereon;
- FIG. 4 is a top view of an antenna structure including a CPW antenna structure being operable to receive right-hand circularly polarized GPS signals;
- FIG. 5 is an isometric view of the antenna structure shown in FIG. 4 being mounted to a curved vehicle glass;
- FIG. 6 is an illustration of a CPW antenna feed structure including a coaxial cable feed line for the antenna structure shown in FIG. 4 ;
- FIG. 7 is a top view of an antenna structure including a CPW antenna structure being operable to receive left-hand circularly polarized SDARS signals;
- FIG. 8 is a top view of an antenna structure including a CPW antenna structure being operable to receive right-hand circularly polarized GPS signals;
- FIG. 9 is a top view of an antenna structure including a CPW antenna structure being operable to receive left-hand circularly polarized SDARS signals.
- FIG. 1 is a front view of a vehicle 10 including a vehicle body 12 , roof 14 and windshield 16
- FIG. 2 is a rear view of the vehicle 10 showing a rear window 18 .
- the present invention proposes providing a thin film, flexible, wideband CPW antenna structure mountable on the windshield 16 , the rear window 18 , or any other window or dielectric substrate on the vehicle 10 , where the antenna structure is flexible to conform to the shape of the particular dielectric structure, and where the antenna structure can be mounted at any suitable location on the dielectric structure, including locations on the windshield 16 that the vehicle driver needs to see through.
- the antenna structure has particular application for receiving circularly polarized signals, such as GPS and SDARS signals.
- the antenna structure is a wideband monopole appliqué antenna that is installed directly on the surface of the dielectric structure by a suitable adhesive.
- the antenna structure can be designed to operate on automotive glass of various physical thicknesses and dielectric properties, where the antenna structure operates as intended when installed on the glass or other dielectric since in the design process the glass or other dielectric is considered in the antenna geometry pattern development.
- FIG. 3 is a profile view of an antenna structure 20 including a windshield 22 having an outer glass layer 24 , an inner glass layer 26 and a polyvinyl butyral (PVB) layer 28 therebetween.
- the structure 20 includes an antenna 30 formed on a thin, flexible film substrate 32 , such as polyethylene terephthalate (PET), biaxially-oriented polyethylene terephthalate (BoPET), mylar, flexible glass substrates, Kapton, etc., and adhered to a surface of the layer 26 by an adhesive layer 34 .
- PET polyethylene terephthalate
- BoPET biaxially-oriented polyethylene terephthalate
- mylar flexible glass substrates
- Kapton Kapton
- the adhesive layer 34 can be any suitable adhesive or transfer tape that effectively allows the substrate 32 to be secured to the glass layer 26 , and further, if the antenna 30 is located in a visible area of the glass layer 26 , the adhesive or transfer tape can be transparent or near transparent so as to have a minimal impact on the appearance and light transmission therethrough.
- the antenna 30 can be protected by a low RF loss passivation layer 36 , such as parylene.
- An antenna connector 38 is shown connected to the antenna 30 and can be any suitable RF or microwave connector such as a direct pig-tail or coaxial cable connection.
- the conductor 30 can be adhered to the outer surface of the outer glass layer 24 or the surface of the layers 24 or 26 adjacent to the PVB layer 28 or the surfaces of the PVB layer 28 .
- the antenna 30 can be formed by any suitable low loss conductor, such as copper, gold, silver, silver ceramic, metal grid/mesh, etc. If the antenna 30 is at a location on the vehicle glass that requires the driver or other vehicle occupant to see through the glass, then the antenna conductor can be any suitable transparent conductor, such as indium tin oxide (ITO), silver nano-wire, zinc oxide (ZnO), etc. Performance of the antenna 30 when it is made of a transparent conductor could be enhanced by adding a conductive frame along the edges of the antenna 30 as is known in the art.
- ITO indium tin oxide
- ZnO zinc oxide
- the thickness of automotive glass may vary approximately over 2.8 mm-5 mm and have a relative dielectric constant ⁇ r in the range of 4.5-7.0.
- the antenna 30 includes a single layer conductor and a co-planar waveguide (CPW) feed structure to excite the antenna radiator.
- the CPW feed structure can be configured for mounting the connector 38 in a manner appropriate for the CPW feed line or for a pigtail or a coaxial cable.
- the antenna 30 can be protected with the passivation layer 36 .
- a backing layer of the transfer tape can be removed.
- the antenna structure is a variation of a CPW fed square slot antenna with a T-line and spur-line to produce circularly polarized signals adapted for a curved surface of a vehicle glass.
- FIG. 4 is a top view of an antenna structure 40 that has application to operate in the GPS frequency band to receive right-hand circularly polarized signals and is of the type discussed herein that can be secured to vehicle glass.
- FIG. 5 is an isometric illustration 42 of the antenna structure 40 secured to a surface 44 of a curved vehicle glass 46 by an adhesive layer 48 .
- the antenna structure 40 includes a conductive ground plane 50 having a square outer perimeter portion 54 defining a square slot 52 therein that is patterned along with other conductive portions of the antenna structure 40 on a suitable substrate (not shown), such as mylar.
- the ground plane 50 includes a T-line tuning stub 56 extending into the slot 52 from one side of the perimeter portion 54 , where the stub 56 includes a line portion 58 and a T-end 60 .
- the ground plane 50 also includes a spur-line tuning stub 64 electrically coupled to one of the corners of the perimeter portion 54 and extending into the slot 52 , where the tuning stub 64 includes an angled portion 66 and a straight portion 68 .
- An antenna radiating element 70 also extends into the slot 52 and ends at a central part of the slot 52 proximate the T-end 60 of the T-line tuning stub 56 .
- the element 70 includes a feed line portion 72 that is positioned within a gap 74 in the perimeter portion 54 and is electrically isolated therefrom, where the feed line portion 72 is part of a CPW feed structure 76 .
- the antenna structure 40 When the antenna structure 40 receives GPS signals, currents are generated in the perimeter portion 54 and propagate around the slot 52 .
- the tuning stubs 56 and 58 receive those currents and reflect them back into the perimeter portion 54 , which changes the phase of the signals.
- the circular polarization is provided by a 90° phase difference between the currents propagating in perpendicular sections of the perimeter portion 54 .
- the T-line tuning stub 56 provides coupling of the currents from the perimeter portion 54 to the radiating element 60 .
- the length of the tuning stubs 56 and 64 , the angle that the tuning stub 64 extends from the perimeter portion 54 , etc., are all selectively optimized for the particular frequency band of interest.
- the GPS signals are right-hand circularly polarized signals, and thus the currents propagate in a counter-clockwise direction.
- the T-line tuning stub 56 and the spur-line tuning stub 64 have different geometries and angles resulting in an improved impedance bandwidth of ⁇ 30%, a 3-db axial ratio bandwidth of ⁇ 16.3%, gain of 3 dBic, and an axial ratio beamwidth at the center frequency stretching over a range greater than + ⁇ 45° for the GPS signals center at 1.575 GHz.
- FIG. 6 is top, cut-away view of the CPW antenna feed structure 76 showing one suitable example.
- a coaxial cable 80 provides the incoming signal line for the feed structure 76 and includes an inner conductor 82 electrically coupled to the feed line portion 72 and an outer ground conductor 84 electrically coupled to the perimeter portion 54 , where the conductors 82 and 84 are separated by an insulator 86 .
- the antenna structure 100 also includes an antenna radiating element 112 having a feed line portion 114 positioned within a gap 116 that is part of a feed structure 118 .
- the T-line tuning stub 110 and the spur-line tuning stub 112 have different geometries and angles resulting in improved impedance bandwidth of ⁇ 39%, a 3-db axial ratio bandwidth of ⁇ 20%, gain of 3 dBic, and an axial ratio beamwidth at the center frequency stretching over a range greater than + ⁇ 45°.
- co-planar circularly polarized antenna structures provides the advantages discussed, and can be positioned on the vehicle glass near a metal structure, such as a vehicle roof, because the outer perimeter portions 54 and 104 operate as a frequency selective surface that prevents surface waves from radiating outward therefrom in a manner understood by those skilled in the art.
- these designs do take up some real-estate and have additional copper patterning that is required for the ground plane. If conductive surfaces close to the antenna are not an issue, then other co-planar circularly polarized antenna structures can be provided that require less area and less ground metal.
- another embodiment includes a co-planar waveguide sleeve monopole antenna structure that also has application to receive GPS and SDARS circularly polarized signals.
- FIG. 8 is a top view of an antenna structure 120 that also operates in the GPS frequency band, but in this embodiment is operable to receive right-hand circularly polarized signals, where the antenna structure 120 is a thin film, flexible co-planar slot type antenna of the type discussed herein that includes patterned conductors printed on a thin flexible substrate.
- the antenna structure 120 includes a conductive ground plane 122 having a slot 124 formed therein and an inverted-L tuning sleeve 128 having a vertical portion 130 and a horizontal portion 132 coupled as part of the ground plane 122 .
- a conductive monopole radiating element 136 is positioned adjacent to the tuning sleeve 128 , but is electrically isolated therefrom and includes a feed portion 138 positioned within the slot 124 .
- the ground plane 122 can have a length of 80 mm and a width of 13.6 mm
- the vertical portion 130 can have a length of 20 mm and the combined length of the horizontal portion 132 and the width of the vertical portion 144 can be 14 mm.
- a gap 150 between the vertical portion 130 and the horizontal portion 142 can be 1.9167 mm
- a gap 152 between the horizontal portion 132 and the horizontal portion 142 can be 0.8379 mm
- a gap between the horizontal portion 132 and the vertical portion 144 can be 0.9080 mm
- a gap 156 between the horizontal portion 140 and the ground plane 122 can be 1.9774 mm.
- FIG. 9 is a top view of an antenna structure 160 that also operates in the SDARS frequency band, but in this embodiment is operable to receive left-hand circularly polarized signals, where the antenna structure 160 is a thin film, flexible co-planar slot type antenna of the type discussed herein that includes patterned conductors printed on a thin flexible substrate.
- the antenna structure 160 is similar to the antenna structure 120 , but is oriented to receive left-hand circularly polarized signals and has dimensions for the SDARS frequency band.
- the antenna structure 160 includes a conductive ground plane 162 having a slot 164 formed therein and an inverted-L tuning sleeve 168 having a vertical portion 170 and a horizontal portion 172 coupled as part of the ground plane 162 .
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Abstract
Description
- This application claims the benefit of the priority date of U.S. Provisional Patent Application Ser. No. 62/332,633, titled, CPW-Fed Modified Sleeve Monopole for GPS, GLONASS, and SDARS Bands, filed May 6, 2016.
- This invention relates generally to a thin film, flexible, wideband antenna configured on a dielectric substrate and, more particularly, to a thin film, flexible, wideband co-planar waveguide (CPW) antenna that may include transparent conductors so as to allow the antenna to be adhered to a visible part of vehicle glass, where the antenna is operable to receive circularly polarized signals for GPS/GNSS or satellite digital audio radio service (SDARS) frequency bands.
- Modern vehicles employ various and many types of antennas to receive and transmit signals for different communications systems, such as terrestrial radio (AM/FM), cellular telephone, satellite radio, dedicated short range communications (DSRC), GPS, etc. Further, cellular telephone is expanding into 4G long term evolution (LTE) that requires two antennas to provide multiple-input multiple-output (MIMO) signals. The antennas used for these systems are often mounted to a roof of the vehicle so as to provide maximum reception capability. Further, many of these antennas are often integrated into a common structure and housing mounted to the roof of the vehicle, such as a “shark-fin” roof mounted antenna module. As the number of antennas on a vehicle increase, the size of the structures required to house all of the antennas in an efficient manner and providing maximum reception capability also increases, which interferes with the design and styling of the vehicle. Because of this, automotive engineers and designers are looking for other suitable areas on the vehicle to place antennas that may not interfere with vehicle design and structure.
- One of those areas is the vehicle glass, such as the vehicle windshield, which has benefits because glass typically makes a good dielectric substrate for an antenna. For example, it is known in the art to print AM and FM antennas on the glass of a vehicle where the printed antennas are fabricated within the glass as a single piece. However, these known antennas are generally limited in that they can only be placed in a vehicle windshield or other glass surface in areas where viewing through the glass is not necessary.
- For those antennas that receive satellite signals, such as GPS, SDARS, GLONASS, satellite radio, etc., the transmitted signals are left-hand or right-hand circularly polarized because the ionosphere acts to rotate the transmitted signal, which would otherwise affect linearly polarized signals. Thus, there is a need for a suitable antenna capable of being mounted on vehicle glass and being applicable to receive right-hand or left-hand circularly polarized signals.
- The present invention discloses and describes a thin film, flexible antenna that has particular application to be adhered to a dielectric substrate on a vehicle, such as a vehicle glass, where the antenna has a wideband antenna geometry and is operable to receive right-hand or left-hand circularly polarized signals from, for example, GPS and SDARS satellites. The antenna is a printed planar antenna formed to the substrate and includes a ground plane having a slot formed therein and a tuning sleeve having a vertical portion and a horizontal portion. The planar antenna further includes a radiating element positioned adjacent to the tuning sleeve and including a feed portion positioned within the slot, where the radiating element includes a first horizontal portion and a second horizontal portion extending from a vertical portion towards the vertical portion of the sleeve. The ground plane is operable to generate circularly polarized signals to be received by the radiating element where the sleeve provides phase tuning of the signals.
- Additional features of the present invention will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings.
-
FIG. 1 is front view of a vehicle showing a vehicle windshield; -
FIG. 2 is a rear view of the vehicle showing a vehicle rear window; -
FIG. 3 is a profile view of a vehicle window including a thin, flexible antenna formed thereon; -
FIG. 4 is a top view of an antenna structure including a CPW antenna structure being operable to receive right-hand circularly polarized GPS signals; -
FIG. 5 is an isometric view of the antenna structure shown inFIG. 4 being mounted to a curved vehicle glass; -
FIG. 6 is an illustration of a CPW antenna feed structure including a coaxial cable feed line for the antenna structure shown inFIG. 4 ; -
FIG. 7 is a top view of an antenna structure including a CPW antenna structure being operable to receive left-hand circularly polarized SDARS signals; -
FIG. 8 is a top view of an antenna structure including a CPW antenna structure being operable to receive right-hand circularly polarized GPS signals; and -
FIG. 9 is a top view of an antenna structure including a CPW antenna structure being operable to receive left-hand circularly polarized SDARS signals. - The following discussion of the embodiments of the invention directed to a thin film, flexible wideband antenna suitable to be adhered to a curved dielectric structure is merely exemplary in nature, and is in no way intended to limit the invention or its applications or uses. For example, the discussion herein talks about the antenna being applicable to be adhered to automotive glass. However, as will be appreciated by those skilled in the art, the antenna will have application for other dielectric structures other than automotive structures and other than transparent or translucent surfaces.
-
FIG. 1 is a front view of avehicle 10 including avehicle body 12,roof 14 andwindshield 16, andFIG. 2 is a rear view of thevehicle 10 showing arear window 18. - As will be discussed in detail below, the present invention proposes providing a thin film, flexible, wideband CPW antenna structure mountable on the
windshield 16, therear window 18, or any other window or dielectric substrate on thevehicle 10, where the antenna structure is flexible to conform to the shape of the particular dielectric structure, and where the antenna structure can be mounted at any suitable location on the dielectric structure, including locations on thewindshield 16 that the vehicle driver needs to see through. The antenna structure has particular application for receiving circularly polarized signals, such as GPS and SDARS signals. In one embodiment, the antenna structure is a wideband monopole appliqué antenna that is installed directly on the surface of the dielectric structure by a suitable adhesive. The antenna structure can be designed to operate on automotive glass of various physical thicknesses and dielectric properties, where the antenna structure operates as intended when installed on the glass or other dielectric since in the design process the glass or other dielectric is considered in the antenna geometry pattern development. -
FIG. 3 is a profile view of anantenna structure 20 including awindshield 22 having anouter glass layer 24, aninner glass layer 26 and a polyvinyl butyral (PVB)layer 28 therebetween. Thestructure 20 includes anantenna 30 formed on a thin,flexible film substrate 32, such as polyethylene terephthalate (PET), biaxially-oriented polyethylene terephthalate (BoPET), mylar, flexible glass substrates, Kapton, etc., and adhered to a surface of thelayer 26 by anadhesive layer 34. Theadhesive layer 34 can be any suitable adhesive or transfer tape that effectively allows thesubstrate 32 to be secured to theglass layer 26, and further, if theantenna 30 is located in a visible area of theglass layer 26, the adhesive or transfer tape can be transparent or near transparent so as to have a minimal impact on the appearance and light transmission therethrough. Theantenna 30 can be protected by a low RFloss passivation layer 36, such as parylene. Anantenna connector 38 is shown connected to theantenna 30 and can be any suitable RF or microwave connector such as a direct pig-tail or coaxial cable connection. Although theantenna 30 is shown being coupled to an inside surface of theinner glass layer 26, theconductor 30 can be adhered to the outer surface of theouter glass layer 24 or the surface of thelayers PVB layer 28 or the surfaces of thePVB layer 28. - The
antenna 30 can be formed by any suitable low loss conductor, such as copper, gold, silver, silver ceramic, metal grid/mesh, etc. If theantenna 30 is at a location on the vehicle glass that requires the driver or other vehicle occupant to see through the glass, then the antenna conductor can be any suitable transparent conductor, such as indium tin oxide (ITO), silver nano-wire, zinc oxide (ZnO), etc. Performance of theantenna 30 when it is made of a transparent conductor could be enhanced by adding a conductive frame along the edges of theantenna 30 as is known in the art. - The thickness of automotive glass may vary approximately over 2.8 mm-5 mm and have a relative dielectric constant εr in the range of 4.5-7.0. The
antenna 30 includes a single layer conductor and a co-planar waveguide (CPW) feed structure to excite the antenna radiator. The CPW feed structure can be configured for mounting theconnector 38 in a manner appropriate for the CPW feed line or for a pigtail or a coaxial cable. When theconnector 38 or the pigtail connection to the CPW line is completed, theantenna 30 can be protected with thepassivation layer 36. In one embodiment, when theantenna 30 is installed on the glass, a backing layer of the transfer tape can be removed. By providing the antenna conductor on the inside surface of thevehicle windshield 22, degradation of theantenna 30 can be reduced from environmental and weather conditions. - As discussed above, it is desirable to provide antennas on vehicles that are transparent and can be integrated in a conformal manner to the curved windshield or vehicle glass. The present invention discloses an antenna structure that is operable to receive signals in the GPS or SDARS frequency bands with appropriate polarization when mounted or integrated on the vehicle glass. The antenna structure is shaped and patterned into a transparent conductor and a co-planar structure where both the antenna and ground conductors are printed on the same layer. The antenna can use low cost thin films made of transparent conductive oxides and silver nano-wires with a high conductivity metal frame surrounding the antenna elements.
- In one embodiment, the antenna structure is a variation of a CPW fed square slot antenna with a T-line and spur-line to produce circularly polarized signals adapted for a curved surface of a vehicle glass.
FIG. 4 is a top view of anantenna structure 40 that has application to operate in the GPS frequency band to receive right-hand circularly polarized signals and is of the type discussed herein that can be secured to vehicle glass. For example,FIG. 5 is anisometric illustration 42 of theantenna structure 40 secured to asurface 44 of acurved vehicle glass 46 by anadhesive layer 48. Theantenna structure 40 includes aconductive ground plane 50 having a squareouter perimeter portion 54 defining asquare slot 52 therein that is patterned along with other conductive portions of theantenna structure 40 on a suitable substrate (not shown), such as mylar. Theground plane 50 includes a T-line tuning stub 56 extending into theslot 52 from one side of theperimeter portion 54, where thestub 56 includes aline portion 58 and a T-end 60. Theground plane 50 also includes a spur-line tuning stub 64 electrically coupled to one of the corners of theperimeter portion 54 and extending into theslot 52, where thetuning stub 64 includes anangled portion 66 and astraight portion 68. Anantenna radiating element 70 also extends into theslot 52 and ends at a central part of theslot 52 proximate the T-end 60 of the T-line tuning stub 56. Theelement 70 includes afeed line portion 72 that is positioned within agap 74 in theperimeter portion 54 and is electrically isolated therefrom, where thefeed line portion 72 is part of aCPW feed structure 76. - When the
antenna structure 40 receives GPS signals, currents are generated in theperimeter portion 54 and propagate around theslot 52. The tuning stubs 56 and 58 receive those currents and reflect them back into theperimeter portion 54, which changes the phase of the signals. The circular polarization is provided by a 90° phase difference between the currents propagating in perpendicular sections of theperimeter portion 54. The T-line tuning stub 56 provides coupling of the currents from theperimeter portion 54 to the radiatingelement 60. The length of the tuning stubs 56 and 64, the angle that thetuning stub 64 extends from theperimeter portion 54, etc., are all selectively optimized for the particular frequency band of interest. In this embodiment, the GPS signals are right-hand circularly polarized signals, and thus the currents propagate in a counter-clockwise direction. The T-line tuning stub 56 and the spur-line tuning stub 64 have different geometries and angles resulting in an improved impedance bandwidth of ˜30%, a 3-db axial ratio bandwidth of ˜16.3%, gain of 3 dBic, and an axial ratio beamwidth at the center frequency stretching over a range greater than +−45° for the GPS signals center at 1.575 GHz. - Any suitable feed structure can be employed for feeding the
antenna element 70.FIG. 6 is top, cut-away view of the CPWantenna feed structure 76 showing one suitable example. In this embodiment, acoaxial cable 80 provides the incoming signal line for thefeed structure 76 and includes aninner conductor 82 electrically coupled to thefeed line portion 72 and anouter ground conductor 84 electrically coupled to theperimeter portion 54, where theconductors insulator 86. -
FIG. 7 is a top view of anantenna structure 100 that has application to operate in the SDARS frequency band to receive left-hand circular polarized signals and is the type discussed herein that can be secured to vehicle glass. Theantenna structure 100 has a similar configuration to theantenna structure 40 where it includes aconductive ground plane 102 having a squareouter perimeter portion 104 defining asquare slot 106 therein. Theground plane 102 includes a T-line tuning stub 108 and a spur-line tuning stub 110, where thetuning stub 110 is on opposite side of theperimeter portion 104 than the tuning thestub 56 and the spur-line tuning stub 110 is at an opposite corner than the tuningstub 64, as shown, for the right-hand circularly polarized signals. Theantenna structure 100 also includes anantenna radiating element 112 having afeed line portion 114 positioned within agap 116 that is part of afeed structure 118. For the embodiment for SDARS signals, which in North America includes Sirius™ and XM™ in the frequency band 2320-2345 MHz, the T-line tuning stub 110 and the spur-line tuning stub 112 have different geometries and angles resulting in improved impedance bandwidth of ˜39%, a 3-db axial ratio bandwidth of ˜20%, gain of 3 dBic, and an axial ratio beamwidth at the center frequency stretching over a range greater than +−45°. - The embodiments discussed above for the co-planar circularly polarized antenna structures provides the advantages discussed, and can be positioned on the vehicle glass near a metal structure, such as a vehicle roof, because the
outer perimeter portions -
FIG. 8 is a top view of anantenna structure 120 that also operates in the GPS frequency band, but in this embodiment is operable to receive right-hand circularly polarized signals, where theantenna structure 120 is a thin film, flexible co-planar slot type antenna of the type discussed herein that includes patterned conductors printed on a thin flexible substrate. Theantenna structure 120 includes aconductive ground plane 122 having aslot 124 formed therein and an inverted-L tuning sleeve 128 having avertical portion 130 and ahorizontal portion 132 coupled as part of theground plane 122. A conductivemonopole radiating element 136 is positioned adjacent to thetuning sleeve 128, but is electrically isolated therefrom and includes afeed portion 138 positioned within theslot 124. Any suitable feed structure can be provided to feed the radiatingelement 136, such as thefeed structure 76 shown inFIG. 6 . The radiatingelement 136 includes a firsthorizontal portion 140 and a secondhorizontal portion 142 extending from a vertical portion 144 towards thevertical portion 130 of thesleeve 128, as shown. When theantenna structure 120 receives the GPS signals, currents are generated in theorthogonal portions sleeve 128 and theradiating element 136 in both a horizontal and vertical direction that are orthogonal to each other to generate the right-hand circularly polarized signals. - For GPS signals in the frequency band 1574.4-1576.4 MHz, the
ground plane 122 can have a length of 80 mm and a width of 13.6 mm, thevertical portion 130 can have a length of 20 mm and the combined length of thehorizontal portion 132 and the width of the vertical portion 144 can be 14 mm. Further, agap 150 between thevertical portion 130 and thehorizontal portion 142 can be 1.9167 mm, agap 152 between thehorizontal portion 132 and thehorizontal portion 142 can be 0.8379 mm, a gap between thehorizontal portion 132 and the vertical portion 144 can be 0.9080 mm, and agap 156 between thehorizontal portion 140 and theground plane 122 can be 1.9774 mm. -
FIG. 9 is a top view of anantenna structure 160 that also operates in the SDARS frequency band, but in this embodiment is operable to receive left-hand circularly polarized signals, where theantenna structure 160 is a thin film, flexible co-planar slot type antenna of the type discussed herein that includes patterned conductors printed on a thin flexible substrate. Theantenna structure 160 is similar to theantenna structure 120, but is oriented to receive left-hand circularly polarized signals and has dimensions for the SDARS frequency band. Theantenna structure 160 includes aconductive ground plane 162 having aslot 164 formed therein and an inverted-L tuning sleeve 168 having avertical portion 170 and ahorizontal portion 172 coupled as part of theground plane 162. A conductivemonopole radiating element 176 is positioned adjacent to thetuning sleeve 168, but is electrically isolated therefrom, and includes afeed portion 178 positioned within theslot 164. The radiatingelement 176 includes a firsthorizontal portion 180 and a secondhorizontal portion 182 extending from avertical portion 184 towards thevertical portion 170 of thesleeve 168, as shown. When theantenna structure 160 receives the SDARS signals, currents are generated in theorthogonal portions sleeve 168 and theradiating element 176 in both a horizontal and vertical direction to generate the left-hand circularly polarized signals. - The foregoing discussion discloses and describes merely exemplary embodiments of the present invention. One skilled in the art will readily recognize from such discussion and from the accompanying drawings and claims that various changes, modifications and variations can be made therein without departing from the spirit and scope of the invention as defined in the following claims.
Claims (20)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US15/583,273 US10707553B2 (en) | 2016-05-06 | 2017-05-01 | CPW-fed modified sleeve monopole for GPS, GLONASS, and SDARS bands |
DE102017109743.0A DE102017109743A1 (en) | 2016-05-06 | 2017-05-05 | CPW-fed modified sleeve monopole for GPS, GLONASS and SDARS bands |
CN201710317615.0A CN107453027B (en) | 2016-05-06 | 2017-05-08 | CPW feed modified sleeve monopole for GPS, GLONASS and SDARS bands |
Applications Claiming Priority (2)
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US201662332633P | 2016-05-06 | 2016-05-06 | |
US15/583,273 US10707553B2 (en) | 2016-05-06 | 2017-05-01 | CPW-fed modified sleeve monopole for GPS, GLONASS, and SDARS bands |
Publications (2)
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US20170324141A1 true US20170324141A1 (en) | 2017-11-09 |
US10707553B2 US10707553B2 (en) | 2020-07-07 |
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US15/583,273 Active 2037-08-27 US10707553B2 (en) | 2016-05-06 | 2017-05-01 | CPW-fed modified sleeve monopole for GPS, GLONASS, and SDARS bands |
Country Status (3)
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US (1) | US10707553B2 (en) |
CN (1) | CN107453027B (en) |
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US20210408694A1 (en) * | 2020-06-30 | 2021-12-30 | Novatel Inc. | Antenna with tilted beam for use on angled surfaces |
US20220263217A1 (en) * | 2021-02-18 | 2022-08-18 | Hyundai Motor Company | Single glass antenna structure |
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DE4420903C1 (en) * | 1994-06-15 | 1996-01-25 | Sekurit Saint Gobain Deutsch | Antenna disk and process for its manufacture |
JPH10308620A (en) * | 1997-05-08 | 1998-11-17 | Harada Ind Co Ltd | Film antenna system for gps wave |
DE10033336A1 (en) * | 1999-08-11 | 2001-04-12 | Heinz Lindenmeier | Diversity antenna for diversity system in vehicle has edge conductor on side of conducting surface with minimum length of about tenth of wavelength, forming low impedance coupling line |
US6552690B2 (en) * | 2001-08-14 | 2003-04-22 | Guardian Industries Corp. | Vehicle windshield with fractal antenna(s) |
EP1517403A3 (en) * | 2003-08-29 | 2006-04-12 | Fujitsu Ten Limited | Circular polarization antenna and composite antenna including this antenna |
JP4881858B2 (en) * | 2005-04-01 | 2012-02-22 | 日本写真印刷株式会社 | Transparent antenna for vehicle and glass for vehicle with antenna |
US7233296B2 (en) * | 2005-08-19 | 2007-06-19 | Gm Global Technology Operations, Inc. | Transparent thin film antenna |
US7847745B2 (en) * | 2007-11-20 | 2010-12-07 | Centre Luxembourgeois De Recherches Pour Le Verre Et La Ceramique S.A. (C.R.V.C.) | Windshield antenna and/or vehicle incorporating the same |
EP2404347A4 (en) * | 2009-03-03 | 2014-04-23 | Tyco Electronics Services Gmbh | Balanced metamaterial antenna device |
BRPI1015942A2 (en) * | 2009-07-09 | 2016-04-19 | Asahi Glass Co Ltd | vehicle window glass and antenna. |
US8754819B2 (en) * | 2010-03-12 | 2014-06-17 | Agc Automotive Americas R&D, Inc. | Antenna system including a circularly polarized antenna |
JP5640516B2 (en) * | 2010-07-15 | 2014-12-17 | セントラル硝子株式会社 | Glass antenna for vehicles |
JP2014033243A (en) * | 2010-11-30 | 2014-02-20 | Asahi Glass Co Ltd | Vehicle window glass and antenna |
EP2649672A1 (en) * | 2010-12-09 | 2013-10-16 | AGC Automotive Americas R & D, Inc. | Window assembly having transparent layer with an opening for an antenna element |
JP2014045230A (en) * | 2010-12-28 | 2014-03-13 | Asahi Glass Co Ltd | Antenna device |
JP5917928B2 (en) * | 2012-01-31 | 2016-05-18 | 日本板硝子株式会社 | Window glass with seal member |
JP6102211B2 (en) * | 2012-11-20 | 2017-03-29 | 船井電機株式会社 | Multi-antenna device and communication device |
-
2017
- 2017-05-01 US US15/583,273 patent/US10707553B2/en active Active
- 2017-05-05 DE DE102017109743.0A patent/DE102017109743A1/en active Pending
- 2017-05-08 CN CN201710317615.0A patent/CN107453027B/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210408694A1 (en) * | 2020-06-30 | 2021-12-30 | Novatel Inc. | Antenna with tilted beam for use on angled surfaces |
US11955713B2 (en) * | 2020-06-30 | 2024-04-09 | Novatel Inc. | Antenna with tilted beam for use on angled surfaces |
US20220263217A1 (en) * | 2021-02-18 | 2022-08-18 | Hyundai Motor Company | Single glass antenna structure |
Also Published As
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DE102017109743A1 (en) | 2017-11-09 |
CN107453027A (en) | 2017-12-08 |
US10707553B2 (en) | 2020-07-07 |
CN107453027B (en) | 2021-01-05 |
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